In the present state of the science of sociology the man who has studied it at all is very sure to feel great self-distrust in trying to talk about it. The most that one of us can do at the present time is to appreciate the promise which the science offers to us, and to understand the lines of direction in which it seems about to open out. As for the philosophy of the subject, we still need the master to show us how to handle and apply its most fundamental doctrines. I have the feeling all the time, in studying and teaching sociology, that I have not mastered it yet in such a way as to be able to proceed in it with good confidence in my own steps. I have only got so far as to have an almost overpowering conviction of the necessity and value of the study of that science. Mr. Spencer addressed himself at the outset of his literary career to topics of sociology. In the pursuit of those topics he found himself forced (as I understand it) to seek constantly more fundamental and wider philosophical doctrines. He came at last to fundamental principles of the evolution philosophy. He then extended, tested, confirmed, and corrected these principles by inductions from other sciences, and so finally turned again to sociology, armed with the scientific method which he had acquired. To win a powerful and correct method is, as we all know, to win more than half the battle. When so much is secured, the question of making the discoveries, solving the problems, eliminating the errors, and testing the results, is only a question of time and of strength to collect and master the data.